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Commit6448704

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Fix assorted syscache lookup sloppiness in partition-related code.
heap_drop_with_catalog and ATExecDetachPartition neglected to check forSearchSysCache failures, as noted in bugs #14927 and #14928 from Pan Bian.Such failures are pretty unlikely, since we should already have some sortof lock on the rel at these points, but it's neither a good idea norper project style to omit a check for failure.Also, StorePartitionKey contained a syscache lookup that it never didanything with, including never releasing the result. Presumably thereason why we don't see refcount-leak complaints is that the lookupalways fails; but in any case it's pretty useless, so remove it.All of these errors were evidently introduced by the relationpartitioning feature. Back-patch to v10 where that came in.Amit Langote and Tom LaneDiscussion:https://postgr.es/m/20171127090105.1463.3962@wrigleys.postgresql.orgDiscussion:https://postgr.es/m/20171127091341.1468.72696@wrigleys.postgresql.org
1 parenta57aa43 commit6448704

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2 files changed

+5
-3
lines changed

2 files changed

+5
-3
lines changed

‎src/backend/catalog/heap.c

Lines changed: 2 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1769,6 +1769,8 @@ heap_drop_with_catalog(Oid relid)
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* shared-cache-inval notice that will make them update their index lists.
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*/
17711771
tuple=SearchSysCache1(RELOID,ObjectIdGetDatum(relid));
1772+
if (!HeapTupleIsValid(tuple))
1773+
elog(ERROR,"cache lookup failed for relation %u",relid);
17721774
if (((Form_pg_class)GETSTRUCT(tuple))->relispartition)
17731775
{
17741776
parentOid=get_partition_parent(relid);
@@ -3105,9 +3107,6 @@ StorePartitionKey(Relation rel,
31053107

31063108
Assert(rel->rd_rel->relkind==RELKIND_PARTITIONED_TABLE);
31073109

3108-
tuple=SearchSysCache1(PARTRELID,
3109-
ObjectIdGetDatum(RelationGetRelid(rel)));
3110-
31113110
/* Copy the partition attribute numbers, opclass OIDs into arrays */
31123111
partattrs_vec=buildint2vector(partattrs,partnatts);
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partopclass_vec=buildoidvector(partopclass,partnatts);

‎src/backend/commands/tablecmds.c

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -13815,6 +13815,9 @@ ATExecDetachPartition(Relation rel, RangeVar *name)
1381513815
classRel=heap_open(RelationRelationId,RowExclusiveLock);
1381613816
tuple=SearchSysCacheCopy1(RELOID,
1381713817
ObjectIdGetDatum(RelationGetRelid(partRel)));
13818+
if (!HeapTupleIsValid(tuple))
13819+
elog(ERROR,"cache lookup failed for relation %u",
13820+
RelationGetRelid(partRel));
1381813821
Assert(((Form_pg_class)GETSTRUCT(tuple))->relispartition);
1381913822

1382013823
(void)SysCacheGetAttr(RELOID,tuple,Anum_pg_class_relpartbound,

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